git: 9front

ref: 80c53fa06eaef7e4b0844ef696c1a4637bdea2a6
dir: /sys/src/9/teg2/io.h/

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#define BUSUNKNOWN	(-1)

#define PCIWINDOW	0
#define PCIWADDR(va)	(PADDR(va)+PCIWINDOW)